Airtel — airtel sim upgrade issue

I had an older SIM, Airtel sent me messages to upgrade from 3G to 4G saying it is compulsory process. I went to airtel store green park delhi and was given a new SIM. The representative gave me a new SIM after sending a code to cuatomer care with from my old SIM and said that it will be activated in a day. But my phone is still not showing signal.

Phone number: [protected] (Prepaid)
Alternate number: [protected].
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Dear sir

i was in Saudi Arabia last 3 month i am come back to india 30 November my number is [protected] i revived last massages from air tel 2 November 2017 this number issue md shamim uddin way block my mobile number please reactivate my number

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